Attachment for zig-zag sewing machines



Sept. 10, 1957 M. A. ZUCKER 2,805,634

ATTACHMENT FOR Z IG'-ZAG SEWINGMACHINES Filed Sept. 27, 1954 2 Sheets-Sheet 1 INVENTOR 07c e r ATTORN E Y5 Sept. 10, 1957 M. A. ZUCKER 2,895,634

ATTACHMENT FOR ZIG-ZAG SEWING. MACHINES Filed Sept. 27, 1954 2 Sheets-Sheet 2 INVENTOR Mai Z u 01: e r

ATTORNEYS ATTACHMENT FUR ZHG-ZAG SEWING MACHIN ES Morris A. Zncker, Bronx, N. Y. Application September 27, 1954, Serial No. 458,373

3 Claims. (Cl. 112-458) This invention relates to an attachment for a zig-zag sewing machine of the type manufactured by the Singer Manufacturing Co. under the identifying number l07Wl, and further shown in Patent 1,020,089, issued March 12, 1912, and has as its primary object the provision of such an attachment whereby the needle arm is swung pivotally in a wholly automatic manner without manual eifort during each up and down stroke thereof to provide an embroidered design on a zig-Zag sewing machine.

A further object of the invention is the provision of means whereby the length of the pattern of zig-zag stitches may be readily varied as desired.

Still another object of the invention is the provision of such a device having changeable sprocket means govern ing the distance of the crowns and valleys of the zigzag stitched design.

A still further object of the invention resides in the provision of an improved eccentric pin means for pivotally swinging the needle arm.

Still other objects reside in the combination of elements, arrangement of parts, and features of construction, all as will be more fully pointed out hereinafter and shown in the accompanying drawings wherein:

Figure 1 is a side elevational view of one form of mechanism embodying the instant invention as applied to a zig-Zag sewing machine, only a fragment of the latter being shown.

Figure 2 is a fragmentary detail sectional view showing a portion of the driving mechanism for pivoting the lever arm.

Figure 3 is a sectional view taken substantially along the line 3-3 of Figure l, as viewed in the direction indicated by the arrows.

Figure 4 is a sectional view taken substantially along the line 4-4 of Figure 2, as viewed in the direction indicated by the arrows.

Figure 5 is an enlarged plan view of a constructional detail.

Figure 6 is an enlarged sectional view taken substantially along the line 6--6 of Figure l, as viewed in the direction indicated by the arrows.

Figure 7 is a fragmentary view showing the type of zig-zag stitching achieved by the use of this device.

Similar reference characters refer to similar parts throughout the several views of the drawings.

Having reference now to the drawings in detail, there is generally indicated at 10 a zig-zag sewing machine frame or body, to which is pivotally connected as by a pivot 11 an arm 12. The arm 12 being adapted to be oscillated about pivot 11 in a manner to be more fully described hereinafter.

A conventional reciprocating shaft 13 is carried in suitable bean'ngs forming a part of arm 12 and carries at its lower end a pair of needles 14 for forming a double row of zig-zag stitches. An operating arm 15 serves to vertically reciprocate the needles 14 through shaft 13.

An arm 17 extends from within the body 10 and carries at its extremity a bearing 19 which contains a cylindrical member 20 forming part of a stub shaft 21, formed with a collar 22 abutting the side of bearing 19. The arm 17 is conventional and is caused to reciprocate by mechanism not shown to swing the arm 12 on pivot 11 in a conventional manner. Cylindrical portion 20 has an eccentric pin 23 which engages in a bore 24 in an oifset portion 25 of arm 12. Obviously, rotation of the shaft 21 will, through eccentric pin 23, occasion movement of the lower end of the arm 12 to oscillate the same about pivot 11.

The shaft 21 also carries a sprocket 30, which is connected by means of a driving chain 31 to a second sprocket 32 rotatably mounted on a shaft 33. The shaft 33 carries thereon a member 34 at the end of which is an idler gear 35 which bears against the chain 31.

The shaft 33 also carries a relatively large sprocket 36 which is driven through a chain 37 by a sprocket 38 which is mounted on a shaft 39 suitably supported on frame 10. Shaft 39 also carries a relatively large gear 40 which is adapted to be driven by means of a spur gear 41, the latter in turn being driven through a shaft 42 connected to the conventional drive mechanism of the sewing machine. v

p A depending bracket 43 serves as a supplemental support for the shaft 33. As best shown in Figure 3, suitable integral collars 44 and 45 provided with set screws 46 and 47, respectively, serve to hold the sprocket 36 against inward movement on shaft 33, while a collar 43 held in place by a set screw 49 serves to limit the outward movement thereof. A collar 50 held in place by means of a set screw 51 correspondingly holds the sprocket 30 in position on shaft 21.

It will now be seen that rotation of the shaft 21 will, through the gears and sprockets and chains previously described, occasion rotation of cylindrical member 20, and consequently rotation of eccentric pin 23 will oscillate the arm 12 and produce zig-zag stitching. Equally obvious, variation in the throw of pin 23 will vary the length of the zig-zag stitches and consequently the apparent width of the rows of zig-zag stitches.

Means are provided whereby the eccentric pin 23 may be readily replaced, and take the form of a spring arm which is secured normally as by bolts 61 to a housing cover 62 which comprises a conventional part of the sewing machine frame 10. The arm includes an offset portion 63, and has secured thereto as by means of a screw 64 a housing 65 including an outer wall 66 and side and end flanges 67 of a configuration to surround and hence protect chain 31 and associated sprockets 50 and 32. A transverse bar portion 68 extends between the upper and lower side flanges 67 and serves to center the spring bar 60 relative to the protective housing 65.

The free end 69 of spring arm 65 bears against the outer extremity of shaft 21 serving to hold the eccentric pin 23 in position within the bore 2-; of portion 25 of arm 12.

When it is desired to replace eccentric pin 23, the bolts 61 may be loosened and the housing 65 and arm 60 removed completely from the machine. It is then a simple matter to withdraw the shaft 21 and replace it with an additional shaft and integral eccentric having a different length of throw.

In Figure 7 there is shown a piece of cloth or the like 70 provided with rows of zig-zag stitches 7i produced by the attachment above described.

By changing any of sprockets 3t 32, as, or 38, to change the R. P. M. of the shaft 33 and consequently the rate of rotation of the shaft 21 the pattern of the zig-zag design may be varied to alter the crowns and valleys thereof. These sprockets are so arran ed and constructed that they may be easily changed by the operator.

From the foregoing it will now be seen that there is herein provided a device which accomplishes all the objects of this invention, and others, includingmany advantages. of great practical utility andcommercial iinportance.

As many embodiments may be made of this inventive concept, and as manywmodificationsma'y be made in the embodiment hereinbefore shown and described, iti's to be understood that all matter herein is to be interpreted merely as illustrative and not ina limiting sense.

What is claimed is:

1. An attachment for zig-zag sewingmachines of the type having a pivoted arm, means connected to said arm for pivoting said arm, a reciprocating rod carried by said arm, a needle carriedby said rod, an extension on said arm comprising an ,ecc entricpin connecting said pivoted armand the means for'pivoting said arm, a shaft carrying said. pin, a bushing for said shaft, said shaft being disposed. intermediate said extension and spring means for releasably holding said shaft insaid bushing, means for rotating said shaft, and means connecting said last mentioned means with the drive mechanism of the sewing machine.

2. An attachment for zig-zag sewing machines of the type having a pivoted arm, means connected 'to said arm for pivoting said arm, a reciprocating rod carried by said arm comprising an eccentric pin connecting said said arm comprising an eccentric pin connectiongsaid pivoted arm and the means for pivoting said arm, a shaft integrally carrying said pin,-a bushing for said shaft, said shaft being disposed intermediate said extension and spring means for releasably holding said shaft in said bushing, said spring means comprising a resilient arm secured at one end to said sewing machine and having its free end abutting the end of said shaft, means for rotating said shaft, and means connecting said last mentioned means with the drive mechanism of the sewing machine.

3. An attachment for zig-zag sewing machines of the type having a pivoted arm, means connected to said arm for pivoting said arm, a reciprocating rod carried by said arm, a needle carried by said rod, an extension on said arm comprising an eccentric pin connecting said pivoted arm and themeans for pivoting said arm, a shaft integral with said pin, a bushing for said shaft, said shaft being disposed intermediate said extension and spring means for releasably holding said shaft in said bushing, said means comprising a resilient arm secured at one end to said sewing machine and having its free end abutting the end of said shaft, means for rotating said shaft, means connecting said last mentioned means with the drive mechanism of the sewing machine comprising a driven pinion, a gear rotated by said pinion, a sprocket rotated by said gear, a second sprocket, a chain connecting said sprockets for driving said second sprocket, a shaft mounting said second sprocket, a third sprocket on said last mentioned shaft, a fourth sprocket on said first mentioned shaft, and achain connecting said third and fourth sprockets to rotate said first shaft and hence said pin.

2,216,096 Card Sept. 24, 1940 Jocsak et al. July 3, 1951' 

